Lab Midterm Flashcards
(27 cards)
What phylum is known as sponges
Phylum Porifera
What are the Classes of Phylum Porifera
Class Calcarea
Class Hexactinellida
Class Demospongiae
What is the defining feature of class Calcarea
a sponge of medium complexity. See a close-up of the syconoid body wall with choanocyte-lined incurrent canals
What is the defining feature of Class Hexactinellida
Glass sponges have interconnected silica and chitin spicules and no spongin, resulting in a delicate structure like Euplectella sp
What is the defining feature of Class Demospongiae
sp. ). these sponges form gemmule similar to the kind that may be produced by freshwater Spongilla
- 80% of all sponges
What are Gemmules?
Gemmules are dormant structures that are quite resistant to desiccation, freezing and anoxia
What are spicules?
The skeletal support system in sponges includes rod-like structures called spicules
What are the three body types of sponges?
asconoid - simple
syconoid
leuconoid - most complex
what layer is are archaeoctyes located in sponges
Mesohyl - Middle layer
What are the two types of sponge larva?
- solid parenchymula larva
- hollow amphiblastula larva
What phylum do jelly fish belong to and what are the general characteristics?
Phylum Cnidaria
• Planula larva
• Secretion of cnidae (nematocyts) for feeding and defense
• May exist in medusa or polyp form, or may alternate through life cycle
• Have gelatinous layer called mesoglea
• Primarily carnivorous
• Nerves and muscles present, but no CNS
What class belong to the Phylum Cnidaria?
Class Hydrozoa (Hydra) Class scyphozoan(Jelly fishes) Class Cubozoa (Sea wasps)
How do sponges feed?
Sponges use cells called Choanocytes to generate currents of water, capturing food
What are the different types of spicules material?
Calcureous spicules
Silicous spicules
Spongi
What Spicule material is used in Class Calcarea?
Calcareous spicules
No Spongin fibers
What Spicule material is used in Class Hexactinellida?
Siliceous Spicules
No spongin fibers
Synctial outer membrane
What Spicule material is used in Class Demospongiae?
Siliceous Spicules and/ or
Spongin fibers
classify representatives from the 4 classes of Platyhelminthes
Class Turbellaria
Class Trematoda
Class Monogenea
Class Cestoda
4 orders in Class Turbellaria
Order Acoela
Order Tricladida
Order Polycladida
Order Neorhabdocoela
Hydra life cycle and tissue layers
A) Lifecycle diagram detailing asexual (egg and sperm) and asexual (budding) forms of reproduction, and B) detail of cross section of Hydra sp. showing 3 tissue layers: epidermis (external), mesoglea (middle), and gastrodermis (internal with nutritive muscular cells). Also be able to identify the mouth, hypostome, tentacles, body column, basal or pedal disc
Obelis sp lifecycle
Obelia sp. lifecycle, showing metagenesis (alternation between polyp and medusa stages). Note the gonozooid (reproductive structure) and gastrozooid (feeding structure) on the the larger colony to the right. A theca covers the whole colony, most visible as the gonotheca surrounding the gonozooid.
What taxon do anemones belong to?
Subphylum Anthozoa Subclass Zoantharia
What phylum do flatworms belong to?
Phylum Platyhelminthes
What Features do Class turbellaria, Order Acoela
the differences in shape from the other turbellarian groups, and keep in mind the differences in gut structure. This group has no long-lasting digestive cavity, and no distinctive gonads.
